================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x8ca/0x1f30 fs/ext4/xattr.c:1732 Read of size 18446744073709551572 at addr ffff8880576e1850 by task syz.2.10/4368 CPU: 1 PID: 4368 Comm: syz.2.10 Not tainted 6.1.114-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 kasan_check_range+0x27f/0x290 mm/kasan/generic.c:189 memmove+0x25/0x60 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x8ca/0x1f30 fs/ext4/xattr.c:1732 ext4_xattr_block_set+0xa58/0x3920 fs/ext4/xattr.c:1979 ext4_xattr_move_to_block fs/ext4/xattr.c:2616 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2691 [inline] ext4_expand_extra_isize_ea+0x10d5/0x1bb0 fs/ext4/xattr.c:2783 __ext4_expand_extra_isize+0x2f7/0x3d0 fs/ext4/inode.c:5936 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5979 [inline] __ext4_mark_inode_dirty+0x54f/0x920 fs/ext4/inode.c:6057 __ext4_unlink+0x6ed/0xba0 fs/ext4/namei.c:3341 ext4_unlink+0x1d5/0x670 fs/ext4/namei.c:3370 vfs_unlink+0x359/0x5f0 fs/namei.c:4322 do_unlinkat+0x4a5/0x820 fs/namei.c:4390 __do_sys_unlink fs/namei.c:4438 [inline] __se_sys_unlink fs/namei.c:4436 [inline] __x64_sys_unlink+0x45/0x50 fs/namei.c:4436 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5e8b37e719 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5e8c17a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 00007f5e8b535f80 RCX: 00007f5e8b37e719 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180 RBP: 00007f5e8b3f132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5e8b535f80 R15: 00007ffd65ee1238 Allocated by task 4368: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node_track_caller+0xb1/0x220 mm/slab_common.c:956 kmemdup+0x26/0x60 mm/util.c:129 ext4_xattr_block_set+0x884/0x3920 fs/ext4/xattr.c:1927 ext4_xattr_move_to_block fs/ext4/xattr.c:2616 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2691 [inline] ext4_expand_extra_isize_ea+0x10d5/0x1bb0 fs/ext4/xattr.c:2783 __ext4_expand_extra_isize+0x2f7/0x3d0 fs/ext4/inode.c:5936 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5979 [inline] __ext4_mark_inode_dirty+0x54f/0x920 fs/ext4/inode.c:6057 __ext4_unlink+0x6ed/0xba0 fs/ext4/namei.c:3341 ext4_unlink+0x1d5/0x670 fs/ext4/namei.c:3370 vfs_unlink+0x359/0x5f0 fs/namei.c:4322 do_unlinkat+0x4a5/0x820 fs/namei.c:4390 __do_sys_unlink fs/namei.c:4438 [inline] __se_sys_unlink fs/namei.c:4436 [inline] __x64_sys_unlink+0x45/0x50 fs/namei.c:4436 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff8880576e1800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 80 bytes inside of 1024-byte region [ffff8880576e1800, ffff8880576e1c00) The buggy address belongs to the physical page: page:ffffea00015db800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x576e0 head:ffffea00015db800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888017c41dc0 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 75, tgid 75 (kworker/u4:4), ts 80749291966, free_ts 21342439065 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2517 prep_new_page mm/page_alloc.c:2524 [inline] get_page_from_freelist+0x322e/0x33b0 mm/page_alloc.c:4290 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5558 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node_track_caller+0xa0/0x220 mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] pskb_expand_head+0x18c/0x10e0 net/core/skbuff.c:1848 __skb_cow include/linux/skbuff.h:3585 [inline] skb_cow_head include/linux/skbuff.h:3619 [inline] batadv_skb_head_push+0x160/0x1f0 net/batman-adv/soft-interface.c:73 batadv_send_skb_packet+0xea/0x660 net/batman-adv/send.c:86 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:393 [inline] batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:421 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x66f/0x800 net/batman-adv/bat_iv_ogm.c:1701 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1444 [inline] free_pcp_prepare mm/page_alloc.c:1494 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3369 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3464 free_contig_range+0x9a/0x150 mm/page_alloc.c:9518 destroy_args+0xfe/0x997 mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x416/0x46b mm/debug_vm_pgtable.c:1354 do_one_initcall+0x265/0x8f0 init/main.c:1298 do_initcall_level+0x157/0x207 init/main.c:1371 do_initcalls+0x49/0x86 init/main.c:1387 kernel_init_freeable+0x45c/0x60f init/main.c:1626 kernel_init+0x19/0x290 init/main.c:1514 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff8880576e1700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880576e1780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880576e1800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8880576e1880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880576e1900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================